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    <h1>强制缓存1.0 Expire属性</h1>
    <img src="./images/1.png" alt="1.png"/>
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    <h1>强制缓存1.1 cache-control属性</h1>
    <img src="./images/2.png" alt="2.png"/>
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    <h1>协商缓存1.1 cache-control ------- Last-Modified</h1>
    <img src="./images/3.png" alt="3.png"/>
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    <h1>协商缓存1.1 cache-control ------- etag</h1>
    <img src="./images/4.png" alt="4.png"/>
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